Not really since you didn't tell us anything useful - no computer specs, no operating system, not the kind of footage you are using nor your AE settings for memory handling, caches and multiprocessing. This could be anything from permission issues at the system level to file access problems with MediaCache to simply the footage being shot the wrong way and the stabilizer not detecting any patterns for stabilization...

What kind of 1080P? There are hundreds of combinations of codecs and compression schemes. How long is the shot? Warp stabilizer isn't going to work well or maybe at all on a really long shot that's highly compressed.

I tend to agree with Rick. You could simply be running out of memory for longer shots. Using the warp stabilizer employs the same memory logic like MP rendering and you might simply reach the ceiling. It may appear otherwise, but those 6GB aren't that much with some stuff loaded in the program. Try using shorter segments.